Turn the unit off for at least 30 seconds before power it back on.
If you have the unit on a surge protector ... remove it as these unit can create low voltage problems for laser printers.
If the problem persists ( and there's a 50-50 chance it will) my 20+ years experiance with HP printer says you need a new scanner assembly. HP Part# RM1-4724-005CN $90-$120 + installation

It may be better to replace the printer as a used one can be bought for about $250

1. Turn off the power by using the power switch, and then wait at least 30 seconds.2. If a surge protector is being used, remove it. Plug the all-in-one directly into the wall socket.3. Check the FFC connection between the formatter and the scanner.NOTEDo not bend or fold the FFCs during the removal or reinstallation process.4. Try connecting the product to a different power source or surge protector.5. Turn on the power and wait for the all-in one to initialize.6. If the error persists, replace the laser scanner assembly.

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Probably Resolution : 1. Press GO.
The page containing the error will automatically be reprinted.
2. Turn the printer off and then on.
3. Re-seat cables to the laser/ scanner and engine controller.
4. Replace the laser/scanner.

I might as well tell you before hand, I'm Not sure if yours can be repaired but on older models I have repaired them by opening the laser/scanner assembly and removing the little circuit board with the motor and chrome spinning shaft. If you can remove the chrome piece from the motor you do so and then place a very tiny drop of synthetic oil down the shaft, install the chrome piece and spin a few time by hand and put everything back together. You can download the service manual by doing a google search. Look for instructions for removing the laser/scanner.

52 is an internal scanner hardware error.Unplug printer, wait 30 seconds, plug it in and power up.Problem still there...make sure printer is plugged into wall outlet, not surge protector.If error persists you will have to get the laser/scanner assembly replaced.We arn't talking about the scanner/copier assembly at the top of the printer. This is the internal laser/scanner that is used for all your printing.

I think this will have to do with Hardware issues in terms of the "52 scanner error". According to the service manual, this has nothing to do with the ADF, but has to do with the Laser Scanner. The cable to the laser scanner is bad or the laser scanner itself is broken. If the cable is ok, then the Laser Scanner Assembly part number is RM1-0171. I think you could find it if you google it.